// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/browser/renderer_host/render_view_host_factory.h"

#include <memory>

#include "base/logging.h"
#include "base/memory/ptr_util.h"
#include "content/browser/renderer_host/render_view_host_impl.h"
#include "content/browser/renderer_host/render_widget_host_impl.h"

namespace content {

// static
RenderViewHostFactory* RenderViewHostFactory::factory_ = nullptr;

// static
bool RenderViewHostFactory::is_real_render_view_host_ = false;

// static
RenderViewHost* RenderViewHostFactory::Create(
    SiteInstance* instance,
    RenderViewHostDelegate* delegate,
    RenderWidgetHostDelegate* widget_delegate,
    int32_t routing_id,
    int32_t main_frame_routing_id,
    bool swapped_out,
    bool hidden)
{
    // RenderViewHost creation can be either browser-driven (by the user opening a
    // new tab) or renderer-driven (by script calling window.open, etc).
    //
    // In the browser-driven case, the routing ID of the view is lazily assigned:
    // this is signified by passing MSG_ROUTING_NONE for |routing_id|.
    if (routing_id == MSG_ROUTING_NONE) {
        routing_id = instance->GetProcess()->GetNextRoutingID();
    } else {
        // Otherwise, in the renderer-driven case, the routing ID of the view is
        // already set. This is due to the fact that a sync render->browser IPC is
        // involved. In order to quickly reply to the sync IPC, the routing IDs are
        // assigned as early as possible. The IO thread immediately sends a reply to
        // the sync IPC, while deferring the creation of the actual Host objects to
        // the UI thread.
    }
    if (factory_) {
        return factory_->CreateRenderViewHost(instance, delegate, widget_delegate,
            routing_id, main_frame_routing_id,
            swapped_out);
    }
    return new RenderViewHostImpl(
        instance,
        base::MakeUnique<RenderWidgetHostImpl>(
            widget_delegate, instance->GetProcess(), routing_id, hidden),
        delegate, main_frame_routing_id, swapped_out,
        true /* has_initialized_audio_host */);
}

// static
void RenderViewHostFactory::RegisterFactory(RenderViewHostFactory* factory)
{
    DCHECK(!factory_) << "Can't register two factories at once.";
    factory_ = factory;
}

// static
void RenderViewHostFactory::UnregisterFactory()
{
    DCHECK(factory_) << "No factory to unregister.";
    factory_ = nullptr;
}

} // namespace content
